And plus sometimes ducks don't move like chickens in the egg so they probably weren't dead you'll know when there dead when th yolk floats to a side of the egg and turn black so they probably weren't dead till u opened them.
And also if they start to stink and it's a week or a couple of days till te hatch that's normal , most eggs start stinking a day or two before hatch, it can even be a week when they start stinking
If the eggs were cracked open and the duckilings were *not* moving, they were dead already, that I can guarantee. Opening the egg did_not_kill them!
As for smell, I've had thousands hatch under hens and some in the incubator and if they smell, that is *not* normal.
-Kathy